Wow... I'd love to hear this thing running, let alone to see it ridden..!!!.
When you closely look at it, it has a very early engine from Harley at the front of the bike, then it goes to newer engines as it goes to the rear of the bike.
Also looks like photos of which Harley bike the engines were from on the top part of the frame...
Neat concept to show the evolution of the Harley engine in one frame.